γ-butyrolactones are obtained in good yields from 4-trimethylsilyl-3-alkyn-1-ols via Wacker-type oxidation reaction. A mechanism is proposed for this transformation: it involves two successive trans-hydroxypalladations followed by a [PdXSiMe3] syn-elimination and explains why the presence of the silyl group is essential in such a process.
pargyl)-2-hydroxycyclohexanone were respectively obtained by resolution from the corresponding diastereomeric acetal derived from C2-symmetrical diol or from the camphanate ester. Study of the rearrangement of their corresponding imine derivatives has shown that it occurred with complete retention of the stereogenicity.
Thermal rearrangement of α-hydroxy imines with an α-allyl or an α-propargyl substituent
作者:Jean-Michel Vatele、Daniel Dumas、Jacques Gore
DOI:10.1016/0040-4039(90)80205-z
日期:1990.1
In refluxing diglyme, the title α-hydroxy imines and rearrange cleanly to amino ketones and substituted on the carbon α to nitrogen by an allyl or a propargyl group. In the case of α-hydroxy imine , the migration of the allyl group occurs with an allylic transposition.